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Re: Pass-By-Reference question. [message #38496 is a reply to message #38494]

Wed, 10 March 2004 15:34

timrobishaw
Messages: 16
Registered: June 2003

Junior Member

"Christopher Lee" <cl@127.0.0.1> wrote in message
> Duplicate keywords give IDL no chance of knowing what to do, hence it
> complains, and it only looks in the _EXTRA struct if it doesn't find what
> it wants elsewhere. If you want an option of overriding the nodata
> keyword, you need to look for it first

I agree that the best thing to do is to pass NODATA in as an explicit
keyword in this case. However, I strongly disagree with your
interpretation that IDL is confused by duplicate keywords in this
scenario: the point is that keywords passed by reference are
advertised to override keywords set inside the module (and this is a
great thing since you can have a default set of keywords that can be
superseded by user input!) In fact, in the example initially
provided, the XRANGE and YRANGE keywords are "duplicated" by passing
them in by reference and, as advertised, the values passed by
reference override the values set in the call to plot. Anyone have
any other ideas?

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[Message index]

		Re: Pass-By-Reference question. By: Mark Hadfield on Thu, 11 March 2004 12:07
		Re: Pass-By-Reference question. By: David Fanning on Thu, 11 March 2004 04:40
		Re: Pass-By-Reference question. By: Chris Lee on Thu, 11 March 2004 02:12
		Re: Pass-By-Reference question. By: Timm Weitkamp on Thu, 11 March 2004 01:28
		Re: Pass-By-Reference question. By: David Fanning on Wed, 10 March 2004 20:34
		Re: Pass-By-Reference question. By: Mark Hadfield on Wed, 10 March 2004 20:24
		Re: Pass-By-Reference question. By: timrobishaw on Wed, 10 March 2004 19:04
		Re: Pass-By-Reference question. By: Mark Hadfield on Wed, 10 March 2004 15:55
		Re: Pass-By-Reference question. By: timrobishaw on Wed, 10 March 2004 15:34
		Re: Pass-By-Reference question. By: Craig Markwardt on Wed, 10 March 2004 13:24
		Re: Pass-By-Reference question. By: Mark Hadfield on Wed, 10 March 2004 12:13
		Re: Pass-By-Reference question. By: Chris Lee on Wed, 10 March 2004 01:37
		Pass-By-Reference question. (ARG_PRESENT) By: Andry William (Please on Fri, 12 March 2004 11:52
		Re: Pass-By-Reference question. By: Craig Markwardt on Thu, 11 March 2004 17:37

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